.body {
  margin-left: auto;
  margin-right: auto;
  width: 600px;
  height: 100%;
  font-size: 0.8rem;
  text-align: center;

  // 内部通用样式
  .inner {
    span {
      position: absolute;
      left: 0;
      top: 0;
      background-color: rgba(0, 0, 0, 0.5);
      color: white;
    }

    video {
      z-index: 1;
      width: 100%;
      height: 100%;
      object-fit: fill;
      background: none;
      border: 0;
    }
  }

  .bg {
    background-color: #242731;
    width: 100%;
    position: relative;

    .inner;
  }

  .li {
    width: 100%;
    height: auto;
    position: relative;

    .inner;
  }
}
